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United States Patent |
6,113,373
|
Fukuhara
,   et al.
|
September 5, 2000
|
Scroll compressor having an annular seal for a stationary scroll
pressure receiving surface
Abstract
In a scroll compressor, a stationary scroll is pressed toward a movable
scroll by a back pressure of a discharge fluid compressed by a compression
mechanism, and wear powder, produced from an annular seal (which receives
the pressure of the discharge fluid) as a result of precession of the
stationary scroll, is arrested, thereby achieving the scroll compressor
high in efficiency and reliability. A pressure-receiving surface for
receiving a back pressure of the discharge fluid so as to press the
stationary scroll toward the movable scroll is formed on that portion of
the stationary scroll disposed around a communication port which is formed
in the stationary scroll, and communicates with a discharge port. An
annular seal is provided to form a seal between the stationary scroll and
an upper frame around a region of communication between the communication
port and the discharge port in such a manner as to satisfy a necessary
annular sealing surface area, and a circumferential recess is provided on
that side lower in pressure than this annular seal.
Inventors:
|
Fukuhara; Hiroyuki (Otsu, JP);
Muramatsu; Shigeru (Kusatsu, JP);
Shintaku; Hidenobu (Neyagawa, JP);
Iida; Noboru (Kusatsu, JP)
|
Assignee:
|
Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
|
Appl. No.:
|
274207 |
Filed:
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March 23, 1999 |
Foreign Application Priority Data
Current U.S. Class: |
418/55.4; 418/55.5; 418/57 |
Intern'l Class: |
F04C 018/04 |
Field of Search: |
418/55.4,55.5,57
|
References Cited
U.S. Patent Documents
3874827 | Apr., 1975 | Young | 418/55.
|
4877382 | Oct., 1989 | Caillat et al. | 418/55.
|
5329788 | Jul., 1994 | Caillat et al. | 418/55.
|
5346376 | Sep., 1994 | Bookbinder et al. | 418/55.
|
5540572 | Jul., 1996 | Park et al. | 418/55.
|
5674061 | Oct., 1997 | Motegi et al. | 418/55.
|
Foreign Patent Documents |
63-309790 | Dec., 1988 | JP | 418/55.
|
Primary Examiner: Vrablik; John J.
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher, L.L.P.
Parent Case Text
This application is a continuation of application Ser. No. 08/796,382 filed
Feb. 6, 1997, U.S. Pat. No. 5,951,272.
Claims
What is claimed is:
1. A scroll compressor comprising:
(a) a sealed container having an inside and having an axial direction;
(b) a motor for producing a revolving movement;
(c) a crankshaft for receiving the revolving movement from the motor;
(d) an orbital mechanism for receiving the revolving movement from the
crankshaft and for converting the revolving movement to an orbital
movement;
(e) a compression mechanism for applying a suction pressure to the inside
of the sealed container, the compression mechanism having a peripheral
portion with a suction port and a center portion and comprising:
(i) a supporting member secured to the inside of the sealed container, the
supporting member having a center portion with a discharge port at the
center portion of the supporting member;
(ii) a first scroll disposed on the supporting member for movement in the
axial direction and having a first scroll blade projecting toward the
motor, the first scroll having a center portion with a communication port
which communicates with the discharge port;
(iii) a frame disposed between the motor and the first scroll; and
(iv) a second scroll supported by the frame and receiving the orbital
movement from the orbital mechanism to cause relative movement between the
first scroll and the second scroll, the second scroll having a second
scroll blade which forms with the first scroll blade a compression chamber
having a volume which decreases as the relative movement between the first
scroll and the second scroll causes the compression chamber to move from
the peripheral portion of the compression mechanism to the center portion
of the compression mechanism;
wherein said compression chamber is moved by said relative movement from
the peripheral portion of the compression mechanism, drawing a fluid
through the suction port, toward the center portion of the compression
mechanism leading to the discharge port, so as to reduce the volume of
said compression chamber, thereby effecting a compression operation and
discharging the fluid to said discharge port;
wherein the first scroll has a portion disposed around the communication
port, the portion disposed around the communication port having formed
thereon a pressure-receiving surface for receiving a back pressure of the
fluid discharged to the discharge port so as to press said first scroll
toward said second scroll; and
wherein an annular seal portion is provided to form a seal between said
first scroll and the supporting member around a region of communication
between said communication port and said discharge port in such a manner
as to satisfy a necessary annular sealing surface area, means forming a
circumferential recess which is open in a direction toward said annular
seal portion and which defines a space for catching and retaining wear
powder resulting from wear of the annular seal portion is provided on a
side lower in pressure than said annular seal portion, and said
circumferential recess is not in communication with said compression
chamber nor a suction chamber at a bottom portion thereof.
2. A scroll compressor according to claim 1, wherein the motor is an
electric motor.
3. A scroll compressor according to claim 1, wherein the first scroll does
not perform the orbital motion, whereas the second scroll performs the
orbital motion.
4. A scroll compressor according to claim 1, wherein a path of movement of
the wear powder from the annular seal portion to the seal member is not in
communication with the compression chamber.
5. A scroll compressor comprising:
(a) a sealed container having an inside and having an axial direction;
(b) a motor for producing a revolving movement;
(c) a crankshaft for receiving the revolving movement from the motor;
(d) an orbital mechanism for receiving the revolving movement from the
crankshaft and for converting the revolving movement to an orbital
movement;
(e) a compression mechanism for applying a suction pressure to the inside
of the sealed container, the compression mechanism having a peripheral
portion with a suction port and a center portion and comprising:
(i) a supporting member secured to the inside of the sealed container, the
supporting member having a center portion with a discharge port at the
center portion of the supporting member;
(ii) a first scroll disposed on the supporting member for movement in the
axial direction and having a first scroll blade projecting toward the
motor, the first scroll having a center portion with a communication port
which communicates with the discharge port;
(iii) a frame disposed between the motor and the first scroll; and
(iv) a second scroll supported by the frame and receiving the orbital
movement from the orbital mechanism to cause relative movement between the
first scroll and the second scroll, the second scroll having a second
scroll blade which forms with the first scroll blade a compression chamber
having a volume which decreases as the relative movement between the first
scroll and the second scroll causes the compression chamber to move from
the peripheral portion of the compression mechanism to the center portion
of the compression mechanism;
wherein said compression chamber is moved by said relative movement from
the peripheral portion of the compression mechanism, drawing a fluid
through the suction port, toward the center portion of the compression
mechanism leading to the discharge port, so as to reduce the volume of
said compression chamber, thereby effecting a compression operation and
discharging the fluid to said discharge port;
wherein the first scroll has a portion disposed around the communication
port, the portion disposed around the communication port having formed
thereon a pressure-receiving surface for receiving a back pressure of the
fluid discharged to the discharge port so as to press said first scroll
toward said second scroll;
wherein an annular seal portion is provided to form a seal between said
first scroll and the supporting member around a region of communication
between said communication port and said discharge port in such a manner
as to satisfy a necessary annular sealing surface area, means forming a
circumferential recess defining a space for catching wear powder resulting
from wear of the annular seal portion is provided on a side lower in
pressure than said annular seal portion, and said circumferential recess
is not in communication with said compression chamber nor a suction
chamber at a bottom portion thereof, and
wherein, during an operation of the scroll compressor, an entirety of the
circumferential recess is available for receiving the wear powder.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a scroll compressor used in refrigeration air
conditioning for business use and domestic use.
2. Related Art
Electrically-operated compressors, used in refrigeration air conditioning,
are classified into those with a reciprocating compressing portion and
those with a rotary compressing portion, and both have been used in the
field of refrigeration air conditioning for business use and domestic use,
and have grown up, taking advantage of their cost and features.
Scroll-type compressors have been put into practical use, taking advantage
of high-efficiency, low-noise and low-vibration features.
U.S. Pat. No. 3,874,827 discloses a construction in which a back pressure,
produced by a discharge fluid, is exerted on a non-orbital, stationary
scroll which is movable in an axial direction, and the stationary scroll
is urged or pressed toward a movable scroll by this back pressure.
In such a construction, the sealing of several compression chambers, formed
between the stationary and movable scrolls, can be enhanced, and the
performance can be enhanced with a simple construction.
Generally, there has been used a construction in which wraps of stationary
and movable scrolls are pressed against each other in a radial direction
with a suitable force so as to reduce a leakage in the radial direction of
the wraps. However, when the stationary scroll is so designed as to move
in the axial direction, a force, tending to overturn the stationary
scroll, is produced by the force, pressing the wrap of the movable scroll
against the wrap of the stationary scroll, and a force of the compressed
gas, so that the stationary scroll precesses. This precession occurs once
per revolution, and therefore a vibration is applied to an annular seal
member. One of inner and outer sides of the annular seal member contacts
the precessing stationary scroll while the other side contacts an
immovable stationary scroll support member, and the annular seal member
separates a suction pressure portion, which applies a back pressure to the
stationary scroll, from a discharge pressure portion. When a vibration is
thus applied to the annular seal member, the annular seal member is liable
to produce wear powder, and this wear powder is drawn into a compression
mechanism portion, comprising the stationary scroll and the movable
scroll, and is compressed, and flows into a refrigerating cycle connected
to the compressor, and it is possible that this causes the clogging of
filters in an expansion valve and other associated portions. In view of
sealing properties, the annular seal member is, in many cases, made of a
resin, and the amount of wear of the annular seal member will not
adversely affect the reliability of the compressor. However, there is a
high possibility that the wear powder is produced in an amount above an
allowable dirt amount for the refrigerating cycle.
SUMMARY OF THE INVENTION
With the above problems in view, it is an object of this invention to
provide a scroll compressor in which a recess is provided on a
lower-pressure side of an annular seal, and with this construction wear
powder, produced from the annular seal, is prevented from being fed to a
refrigerating cycle, thereby achieving a high reliability of the scroll
compressor.
According to one aspect of the present invention, there is provided a
scroll compressor comprising:
a stationary scroll supported for movement in an axial direction; and
a movable scroll supported for orbital movement, the movable scroll being
engaged with the stationary scroll to form a compression chamber
therebetween;
wherein the compression chamber is moved by the orbital movement from an
outer peripheral side, drawing a fluid through a suction port, toward an
inner peripheral side leading to a discharge port, so as to reduce the
volume of the compression chamber, thereby effecting a compression
operation and discharging the fluid to the discharge port;
wherein a pressure-receiving surface for receiving a back pressure of the
discharge fluid so as to press the stationary scroll toward the movable
scroll is formed on that portion of the stationary scroll disposed around
a communication port which is formed in the stationary scroll, and
communicates the compression chamber with the discharge port; and
wherein an annular seal portion is provided to form a seal between the
stationary scroll and a support member thereof around a region of
communication between the communication port and the discharge port in
such a manner as to satisfy a necessary annular sealing surface area, and
a circumferential recess is provided in the back surface of a flange of
the stationary scroll on that side lower in pressure than the annular seal
portion.
In the above scroll compressor, preferably, there is provided a projection
engaged in the recess in such a manner that a gap between the projection
and the recess is larger than a gap between the stationary scroll and the
stationary scroll support member.
According to another aspect of the invention, there is provided a scroll
compressor comprising:
a stationary scroll supported for movement in an axial direction; and
a movable scroll supported for orbital movement, the movable scroll being
engaged with the stationary scroll to form a compression chamber
therebetween;
wherein the compression chamber is moved by the orbital movement from an
outer peripheral side, drawing a fluid through a suction port, toward an
inner peripheral side leading to a discharge port, so as to reduce the
volume of the compression chamber, thereby effecting a compression
operation and discharging the fluid to the discharge port;
wherein a pressure-receiving surface for receiving a back pressure of the
discharge fluid so as to press the stationary scroll toward the movable
scroll is formed on that portion of the stationary scroll disposed around
a communication port which is formed in the stationary scroll, and
communicates the compression chamber with the discharge port; and
wherein an annular seal portion is provided to form a seal between the
stationary scroll and a support member thereof around a region of
communication between the communication port and the discharge port in
such a manner as to satisfy a necessary annular sealing surface area, and
an annular seal member is provided on that side lower in pressure than the
annular seal portion.
Thus, in the present invention, the recess is provided on the
lower-pressure side of the annular seal, and wear powder, produced from
the annular seal when the annular seal is worn as a result of precession
of the stationary scroll, moves toward the lower-pressure side because of
a pressure difference between the inner and outer sides of the annular
seal, and this wear powder is stored in the recess. Therefore, there will
not be encountered a situation in which the wear powder of the annular
seal is drawn into the compression mechanism, and is compressed there, and
is discharged therefrom to a refrigerating cycle.
There can be provided the projection engaged in the recess in such a manner
that the gap between the projection and the recess is larger than the gap
between the stationary scroll and the stationary scroll support member.
With this construction, wear powder of the annular seal is stored in the
recess, and further the projection prevents the wear power from moving
toward the outer peripheral side, and therefore there will not be
encountered a situation in which the wear powder of the annular seal is
drawn into the compression mechanism, and is compressed there, and is
discharged therefrom to the refrigerating cycle. Further, the annular seal
member can be provided on the lower-pressure side of the annular seal, and
with this construction there will not be encountered a situation in which
the wear powder of the annular seal, separating the higher pressure and
the lower pressure from each other, is drawn into the compression
mechanism, and is compressed there, and is discharged therefrom to the
refrigerating cycle.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of a first embodiment of a scroll
compressor of the present invention;
FIG. 2 is a cross-sectional view showing a compression mechanism portion of
a scroll compressor according to a second embodiment of the invention;
FIG. 3 is a cross-sectional view showing a compression mechanism portion of
a scroll compressor according to a third embodiment of the invention; and
FIG. 4 is a cross-sectional view showing a compression mechanism portion of
a conventional scroll compressor.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will now be described with reference to FIGS. 1 to 4.
First Embodiment
FIG. 1 shows a first embodiment of the present invention. This embodiment
is directed to a vertical-type scroll compressor used in refrigeration air
conditioning, and FIG. 4 shows an overall construction of a conventional
scroll compressor.
Referring to the conventional scroll compressor, a scroll-type compression
mechanism 2 is provided at an upper portion of the interior of a sealed
container 1, and an electric motor 3 for driving the compression mechanism
2 is provided at an intermediate portion of the interior of the sealed
container 1, and an oil reservoir 5 for holding oil (lubricant) 4, as well
as an oil guide 6 for feeding the oil 4 from the oil reservoir 5 to parts
to be lubricated, is provided at a lower portion of the interior of the
sealed container 1. The oil guide 6 may be replaced by another type of
pump.
The compression mechanism 2 comprises a stationary scroll 11 and a movable
scroll 12 engaged with each other as in a conventional construction, and
when the movable scroll 12 is driven to be revolved (that is, to make an
orbital motion), several compression chambers 13, formed between the two
scrolls 11 and 12, are moved from an outer peripheral side, leading to a
suction (or intake) port 14, toward an inner peripheral side leading to a
discharge port 15, so as to reduce the volume of these chambers, thereby
effecting the compression.
A support structure and a drive structure for these scrolls, as well as a
guide structure for a fluid which is drawn, compressed and discharged, can
be of any suitable construction. In this embodiment, the compression
mechanism 2 is of the vertically-installed type, and the upper-side
stationary scroll 11 is engaged with the lower-side movable scroll 12. The
electric motor 3 comprises an annular stator 3a fixedly secured to the
inner side of the sealed container 1, and a rotor 3b provided inside the
stator 3a, and a crankshaft 16 is fixedly secured to the rotor 3b so as to
revolve the movable scroll 12 in the compression mechanism 2.
A lower end portion of the crankshaft 16 is borne by a lower frame 17
within the sealed container 1, and a main shaft 18, formed at an upper end
portion of the crankshaft 16, is borne by an intermediate frame 19 within
the sealed container 1. A roller bearing 21 for bearing the lower end
portion of the crankshaft 16 is mounted on the lower frame 17, and a slide
bearing 22 for bearing the main shaft 18 is provided on the intermediate
frame 19. However, these bearing structures may be replaced by other
suitable ones.
The movable scroll 12 is supported from the lower side by a thrust bearing
portion 19a provided on an upper surface of the intermediate frame 19, and
a follower shaft 12a of the movable scroll 12 is fitted in an eccentric
bearing 23 formed on the crankshaft 16. With this construction, the
movable scroll 12 is revolved by the rotation of the crankshaft 16. An
Oldham ring 24 is provided between the movable scroll 12 and the
intermediate frame 19 for making the movable scroll 12 orbit when the
movable scroll 12 revolves.
The stationary scroll 11 is supported by an upper frame 25, which is
disposed above the stationary scroll 11 and fixedly mounted within the
sealed container 1, so as to move in the axial direction through a
cylindrical slide portion 31. As shown in FIGS. 1 to 4, a pin 26,
projecting from the upper frame 25, is fitted in a radially-extending
recess 27 formed in the stationary scroll 11, thereby preventing the
rotation of the stationary scroll 11.
The stationary scroll 11 has a communication port 28 formed through a
substantially central portion thereof, and the compression chamber 13
communicates with the discharge port 15 through this communication port
28. A pressure-receiving surface 28a for receiving a back pressure of the
discharge fluid is formed on that portion of the upper surface of the
stationary scroll 11 disposed around the communication port 28, and the
stationary scroll 11 is pressed toward the movable scroll 12 by the back
pressure acting on this pressure-receiving surface 28a, so that the
sealing of the compression chambers, formed between the two scrolls 11 and
12, is ensured with this simple construction. An annular seal 29 forms a
seal between the stationary scroll 11 and the upper frame 25 around a
region of communication between the communication port 28 and the
discharge port 15, thereby preventing the discharge cooling medium from
leaking at this communication region.
The compressor of this embodiment is the scroll compressor for
refrigeration air conditioning, and therefore the fluid, which is drawn
into and compressed by the compression mechanism 2, and is discharged
therefrom, is a cooling medium, and the oil 4 is compatible with this
cooling medium.
A gas suction pipe 32 is connected to the suction port 14, and a gas
discharge pipe 34 is connected to the discharge port 15 via a discharge
chamber 33 provided in the sealed container 1.
The oil guide 6 is mounted on the lower end of the crankshaft 16, and is
driven together with the compression mechanism 2 to feed the oil 4 from
the oil reservoir 5 into an oil passage 35, formed longitudinally in the
crankshaft 16, to first supply the oil 4 to the eccentric bearing 23. Part
of the oil 4, supplied to the eccentric bearing 23, is further supplied to
the slide bearing 22 and the compression mechanism 2 through gaps, while
the remainder is returned through a passage 36 to the oil reservoir 5
provided at the lower end portion of the sealed container 1.
The cooling medium, which is drawn into and compressed by the compression
mechanism 2, and is discharged therefrom, contacts the oil 4 in the
compression mechanism 2 to carry the oil 4, and brings the oil 4 to
details, thereby effecting the necessary lubrication.
As shown in FIG. 1, the annular seal 29 comprises an annular seal member 41
interposed between opposed cylindrical slide surfaces 29a and 29b formed
respectively on the stationary scroll and the upper frame 25, and the
annular seal 29 is so designed as to satisfy a sealing surface area
necessary for preventing a leakage of the high-pressure discharge fluid
(cooling medium). A circumferential recess 42 is formed in the stationary
scroll 11 on the lower-pressure side of the annular seal 29. In this
embodiment, although the circumferential recess 42 is formed in the
stationary scroll 11, it may be formed in the upper frame 25, or two such
circumferential recesses may be formed in the stationary scroll 11 and the
upper frame 25, respectively.
With this construction, when the stationary scroll 11 precesses, the
annular seal member 41 is worn to produce wear powder, and this wear
powder is stored in the circumferential recess 42, and is prevented from
moving radially outwardly of the circumferential recess 42. Therefore,
there will not be encountered a situation in which this wear powder is
drawn into the compression mechanism from the outer peripheral portion of
the stationary scroll 11, and is compressed there, and is discharged
therefrom to a refrigerating cycle via the gas discharge pipe 34, and
therefore there can be provided the compressor which is high in
reliability and efficiency.
Second Embodiment
FIG. 2 shows a second embodiment of the present invention. A
circumferential projection (convex portion) 43 is formed on an upper frame
25, and is engaged or received in a circumferential recess 42 formed in a
stationary scroll 11 on a lower-pressure side of an annular seal member
41, and a gap between the circumferential recess 42 and the
circumferential projection 43 is larger than a gap between the stationary
scroll 11 and a stationary scroll support member 50 of the upper frame 25.
Such a circumferential recess may be formed in the upper frame 25, and
such a circumferential projection may be formed on the stationary scroll
11.
With this construction, when the stationary scroll 11 precesses, the
annular seal member 41 is worn to produce wear powder, and this wear
powder is stored in the circumferential recess 42, and is prevented by the
circumferential projection 43, formed on the upper frame 25, from moving,
and therefore this wear powder is prevented from moving to the outside
(that is, the lower-pressure side) of the circumferential recess 42.
Therefore, there will not be encountered a situation in which this wear
powder is drawn into the compression mechanism from the outer peripheral
portion of the stationary scroll 11, and is compressed there, and is
discharged therefrom to a refrigerating cycle via the gas discharge pipe
34, and therefore there can be provided the compressor which is high in
reliability and efficiency.
Third Embodiment
FIG. 3 shows a third embodiment of the present invention. In this
embodiment, a circumferential seal member 46 is provided on a
lower-pressure side of an annular seal member 41. With this construction,
when a stationary scroll 11 precesses, the annular seal member 41 is worn
to produce wear powder, and this wear powder is prevented by the
circumferential seal member 46 from moving to the lower-pressure side.
Therefore, there will not be encountered a situation in which this wear
powder is drawn into the compression mechanism from the outer peripheral
portion of the stationary scroll 11, and is compressed there, and is
discharged therefrom to a refrigerating cycle via the gas discharge pipe
34, and therefore there can be provided the compressor which is high in
reliability and efficiency.
In FIGS. 2 and 3, the other construction is substantially the same as that
of the first embodiment, and therefore identical members or parts are
designated by identical reference numerals, respectively, and repeated
explanation thereof is omitted.
As described above, according to the main features of the scroll compressor
of the present invention, the stationary scroll is movable in the axial
direction relative to the stationary scroll support portion through
guidance of the cylindrical slide portion, and the pressure-receiving
surface, provided around the communication port communicating the
compression chamber with the discharge port, receives a back pressure of
the discharge fluid so as to press the stationary scroll toward the
movable scroll, thereby enhancing the sealing of the compression chambers.
And besides, the annular seal portion, having the necessary sealing
surface area, forms a seal between the stationary scroll and the support
member thereof around the region of communication between the
communication port and the discharge port, thereby positively preventing a
leakage of the high-pressure discharge fluid, and the circumferential
recess is provided on the lower-pressure side of the annular seal portion,
so that wear powder, produced from the annular seal as a result of
precession of the stationary scroll, can be stored in this circumferential
recess, and therefore there will not be encountered a situation in which
the wear powder of the annular seal is drawn into the compression
mechanism, and is compressed there, and is discharged therefrom to the
refrigerating cycle. Therefore, there can be achieved the scroll
compressor which is high in efficiency and reliability.
There is provided the projection engaged in the recess in such a manner
that the gap between the projection and the recess is larger than the gap
between the stationary scroll and the stationary scroll support member.
With this construction, wear powder, produced from the annular seal as a
result of precession of the stationary scroll, is arrested, and therefore
there will not be encountered a situation in which the wear powder of the
annular seal is drawn into the compression mechanism, and is compressed
there, and is discharged therefrom to the refrigerating cycle. Therefore,
there can be achieved the scroll compressor which is high in efficiency
and reliability.
According to the main features of the scroll compressor of the present
invention, the stationary scroll is movable in the axial direction
relative to the stationary scroll support portion through guidance of the
cylindrical slide portion, and the pressure-receiving surface, provided
around the communication port communicating the compression chamber with
the discharge port, receives a back pressure of the discharge fluid so as
to press the stationary scroll toward the movable scroll, thereby
enhancing the sealing of the compression chambers. And besides, the
annular seal portion, having the necessary sealing surface area, forms a
seal between the stationary scroll and the support member thereof around
the region of communication between the communication port and the
discharge port, thereby positively preventing a leakage of the
high-pressure discharge fluid, and the circumferential seal member is
provided on the lower-pressure side of the annular seal, so that wear
powder, produced from the annular seal as a result of precession of the
stationary scroll, can be arrested, and therefore there will not be
encountered a situation in which the wear powder of the annular seal is
drawn into the compression mechanism, and is compressed there, and is
discharged therefrom to the refrigerating cycle. Therefore, there can be
achieved the scroll compressor which is high in efficiency and
reliability.
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